Puzzles - Missing letters puzzles

Exercise : Missing letters puzzles
232.
Answer
:
N
Explanation
:
The sum of the numerical values of the letters around each star is always 55.

233.
Answer
:
I
Explanation
:
Starting on the left, and moving along the diagram to the right, letters move through the alphabet in steps of 5, then 3, then 7, repeating this sequence.